Put a new alternator on my truck after getting a new FICM with the php80 tune on it. The alternator is a 220amp Meangreen. Before i put the new alternator on the truck ran fine, the battery light just kept coming on and off. So i put the higher amp alternator in it. Now my transmission is slipping bad. The tow haul light flashes randomy and the truck will get stuck in tow haul mode until i restart the truck.

Are there any key things I should be looking for when scanning the truck? minus pulling any codes? Like temps? I don't think the transmission fluid has ever been changed since 2004 and the truck has 126,xxx miles on it. Could this also be an issue?

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